import {z} from 'zod'

export type Identifiers = {unique_id: string, eka_code?: (string | null) | undefined, loinc?: (string | null) | undefined};

export type VitalValue = {value_type: 'NUM' | 'BOOL' | 'STR', value: number | boolean | string};

export type VitalUnit = {display_unit: string, ucum_code?: (string | null) | undefined};

export type MeasuredAt = {measurement_type: 'INSTANT' | 'DURATION', start: string, end?: (string | null) | undefined};

export type Vital = {display_name: string, identifiers: Identifiers, vital_value: VitalValue, vital_unit?: VitalUnit | undefined, measured_at: MeasuredAt};

export type VitalRequest = {vitals: Array<Vital>};

export type PatchApiTrackersApiV1VitalsTxnIdArgs = {txn_id: string, body: VitalRequest};

export type PatchApiTrackersApiV1VitalsTxnIdOptions = {baseUrl?: string | undefined, auth?: string | undefined, fetch?: typeof fetch | undefined};

export const processedItem = z.object({resource_type: z.string().optional(), fhir_id: z.string().optional(), identifier: z.string().optional()});

export const failedItem = z.object({resource_type: z.string().optional(), identifier: z.string().optional(), error: z.object({code: z.string().optional(), message: z.string().optional()}).optional()});

export const successResponseWithABHA = z.object({message: z.string().optional(), data: z.object({abha_linking: z.string().optional(), abha_message: z.string().optional(), processing_status: z.object({processed: z.array(processedItem).optional(), failed: z.array(failedItem).optional()}).optional()}).optional()});

export const successResponseWithoutABHA = z.object({message: z.string().optional(), data: z.object({abha_linking: z.string().optional(), processing_status: z.object({processed: z.array(processedItem).optional(), failed: z.array(failedItem).optional()}).optional()}).optional()});

export const patchApiTrackersApiV1VitalsTxnIdResponse = z.union([successResponseWithABHA, successResponseWithoutABHA]);

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Update Patient Vitals and Link to ABHA
 * 
 * PATCH /trackers/api/v1/vitals/{txn_id}
 */
export const patchApiTrackersApiV1VitalsTxnId = async (args: PatchApiTrackersApiV1VitalsTxnIdArgs, options?: PatchApiTrackersApiV1VitalsTxnIdOptions) => {
const {baseUrl = "https://api.eka.care", fetch: fetchFn = fetch, auth} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('content-type', "application/json")
headers.set('accept', "application/json")

if (auth !== undefined) headers.set('authorization', `Bearer ${auth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/trackers/api/v1/vitals/${encodeURIComponent(String(args.txn_id))}${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "PATCH", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(patchApiTrackersApiV1VitalsTxnIdResponse, await res.json())
};